1998 Buick Regal Owner's Manual - Page 45

Q: Which slots should I use for my child? A: With the child seated on the child restraint cushion, use the pair of slots that is at or just above the top of the child's shoulders. With this built-in child restraint, you can adjust the height of the harness.Depending on the seated height of the child,you can route it through upper pair of the slots (A), the middle pair of slots (B) or the lower pair of slots (C). For the child shown here, the harness should go through the middle pair of slots (B). 1-37